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Custom power transformer for Allen 75 amp

70.110.138.84

Posted on June 6, 2022 at 08:21:53
Scholl
Distributor or Rep

Posts: 1275
Joined: March 8, 2001
Hi guys

WE have a rare situation where one leg of the bias winding is shorted to the B+ and the other is open. This unit is different than common Allen 75s. It has only one heater winding and a little different bias circuit.

In order to keep the circuit and patina, we'll unpot the blow one and have a custom one built and pot that in the original can.

Where is a good source for a custom power transformer. Heybor isn't responding to email and phone calls.

Thanks

 

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RE: Custom power transformer for Allen 75 amp, posted on June 6, 2022 at 13:33:56
Triode_Kingdom
Audiophile

Posts: 9483
Location: Central Texas
Joined: September 24, 2006
Someone with a McIntosh was posting about the same problem on another forum. None of the usual sources were willing to take it on, if they even replied. Are you sure there's not an OTS transformer from Hammond or Edcor that might fit in the can and do the job? Maybe you could add a small transformer for bias somewhere on the chassis.


 

RE: Custom power transformer for Allen 75 amp, posted on June 6, 2022 at 13:44:07
Sondek
Audiophile

Posts: 8171
Location: Fort Worth
Joined: May 17, 2000
Contributor
  Since:
April 5, 2002
Maybe drop a dime on the folks at Galaxy?

 

RE: Custom power transformer for Allen 75 amp, posted on June 12, 2022 at 05:37:33
Scholl
Distributor or Rep

Posts: 1275
Joined: March 8, 2001
I've look but can't find a match. We want to keep the amp l0oking original, patina and all so multiple transformers aren't an option yet.

 

thanks for this link, posted on June 13, 2022 at 01:58:37
Story
Audiophile

Posts: 6694
Location: NJ
Joined: December 11, 2000
I sent an inquiry on a toroid but nothing yet. they are taking some time responding though.



 

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